enable explicit_into_iter_loop lint

Cargo.toml

@@ -29,6 +29,7 @@ empty_drop = "warn"
 empty_structs_with_brackets = "warn"
 enum_glob_use = "warn"
 error_impl_error = "warn"
+explicit_into_iter_loop = "warn"
 filetype_is_file = "warn"
 float_cmp_const = "warn"
 format_push_string = "warn"

src/api/client_server/keys.rs

@@ -175,7 +175,6 @@ pub(crate) async fn upload_signatures_route(
                     "Invalid signature.",
                 ))?
                 .clone()
-                .into_iter()
             {
                 // Signature validation?
                 let signature = (